code: def test_numpy_not_installed():
      summarizer = LsaSummarizer()
  
      numpy = lsa_module.numpy
      lsa_module.numpy = None
  
      with pytest.raises(ValueError):
          summarizer(build_document(), 10)
  
      lsa_module.numpy = numpy
  
file_path: sumy/tests/test_summarizers/test_lsa.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import pytest
  import sumy.summarizers.lsa
  from sumy._compat import to_unicode
  from sumy.nlp.stemmers import Stemmer
  from sumy.nlp.tokenizers import Tokenizer
  from sumy.parsers.plaintext import PlaintextParser
  from sumy.summarizers.lsa import LsaSummarizer
  from sumy.utils import get_stop_words
  from ..utils import build_document, load_resource
label_desc: Use image node_id 1 for calling a global function with example usage: test_numpy_not_installed() without return types